HP 288048 manual Problem Cause Solution

		Troubleshooting
Problem	Cause	Solution
Fluid needle will not trigger	Loose or missing fluid needle stop	Replace stop (17) or tighten setscrew
	(17) or setscrew (16).	(16).
	Broken fluid needle (12).	Replace fluid needle (12).
	Air leaking around piston (21).	Replace o-ring (22) or piston assem-
		bly (21).
	Swollen piston o-ring (22).	Replace o-ring (22). Do not immerse
		piston in solvent.
	Insufficient air pressure on the trig-	Increase the air pressure or clean the
	ger.	air line.
	Spray tip (9) is plugged.	Clean the spray tip (9).
	Plug (4) is in the incorrect fluid port.	Move the plug to the fluid port consis-
		tent with manifold plumbing, unless
		you are using the gun in a circulating
		system. If you are, all fluid ports
		should be open, both inside the gun
		and on the manifold.
Fluid does not shut off.	Piston cap (18) not fully tightened.	Tighten piston cap until it bottoms
		out.
	Spring (19) not in place.	Check spring position.
	Swollen piston o-ring (22).	Replace o-ring. Do not immerse pis-
		ton in solvent

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